JP7764231B2 - Possession inspection device - Google Patents

Description

The present invention relates to technology for a personal belongings inspection device that inspects people's belongings using electromagnetic waves.

One method for inspecting personal belongings is to use electromagnetic waves to check for the presence of dangerous objects concealed under clothing. For example, Patent Document 1 discloses a mobile object scanner that detects the position of a moving object (mobile body) such as a pedestrian and switches the propagation direction of terahertz waves depending on the detected position.

Patent document 2 also discloses a millimeter-wave holographic imaging device that generates a millimeter-wave holographic image of a human subject standing in a scanning space and identifies suspected objects.

Japanese Patent Application Laid-Open No. 2019-190951 JP 2015-36680 A

Because baggage inspections at airports do not require relatively fast processing times, multiple officers are stationed along each inspection route, and passengers are often stopped one by one for the process, which takes time.

On the other hand, general facilities such as event venues, public transportation, office buildings, and hotels require faster processing speeds for personal belongings inspection than airports. Therefore, there is a growing need for personal belongings inspection devices that improve safety by inspecting the belongings of visitors while maintaining the speed of entry (also known as throughput). When throughput is a priority, it is desirable to inspect moving objects such as pedestrians, as with the technology described in Patent Document 1 above.

However, in exchange for throughput, personal possession inspection devices that inspect moving objects may not be able to clearly detect dangerous items. In such cases, facility staff must stop the person attempting to enter and conduct an additional possession inspection.

However, providing a separate device for this additional testing, such as the device shown in Patent Document 2, which tests the subject while he or she is standing, requires additional cost and space.

One of the objectives of the present invention is to provide a personal belongings inspection device that can inspect the belongings of a person being inspected, whether the person is moving or stationary.

In a first aspect, the present invention provides a personal belongings inspection device that has a plurality of sensors that detect electromagnetic waves emitted by a person being inspected , and that does not move any of the plurality of sensors when the person being inspected is moving along a path, and that moves at least one of the plurality of sensors while maintaining the receiving direction when the person being inspected is stopped, thereby inspecting the personal belongings of the person being inspected.

The first aspect of the personal belongings inspection device makes it possible to inspect the personal belongings of a person being inspected whether they are moving or stationary.

In the first aspect of the personal belongings inspection device, a second aspect may be adopted in which , when the detectors are moved, at least two of the multiple detectors that sandwich the person being inspected are moved.

The second aspect of the personal belongings inspection device allows inspection of a stationary person from both sides.

In the personal belongings inspection device of the second aspect, when the detectors are moved, a configuration in which two detectors are moved simultaneously may be adopted as a third aspect.

The third aspect of the personal belongings inspection device allows the subject to be inspected from two directions simultaneously.

In the personal belongings inspection device of any one of the first to third aspects, a fourth aspect may be adopted in which, when the sensor is moved, the sensor is moved along the path.

According to the possession inspection device of the fourth aspect, the path is not blocked by the detector when inspecting a stopped person to be inspected.

In a personal possession inspection device of any one of the first to fourth aspects, a fifth aspect may be adopted in which, when the sensor is moved, the receiving direction is changed before the sensor starts moving, and the changed receiving direction is maintained while the sensor is moving.

According to the fifth aspect of the personal belongings inspection device, when inspecting a stationary subject, the receiving direction is adjusted to a direction different from that when the subject is moving before starting the inspection.
In a personal possession inspection device of any one of the first to fifth aspects, when the sensor is moved, a sixth aspect may adopt a configuration in which, after confirming a first posture of the stopped subject, the sensor is moved in a first direction, and after confirming a second posture of the stopped subject that is different from the first posture, the sensor is moved in a second direction that is different from the first direction.

FIG. 2 is a plan view showing an example of a personal belongings inspection device 9 according to an embodiment of the present invention as viewed from above. FIG. 2 is a side view of the internal configuration of the motion detector 1. FIG. 2 is a top view of the internal configuration of the motion detector 1. FIG. 2 is a side view of the internal configuration of the fixed sensor 2. FIG. 2 is a top view of the internal configuration of the fixed sensor 2. FIG. 2 is a diagram showing an example of the configuration of an information processing device 3. FIG. 10 is a flowchart showing an example of the operation flow of a belongings inspection device. FIG. 10 is a flowchart showing an example of the operation flow of a primary inspection process. FIG. 10 is a flowchart showing an example of the operation flow of the secondary inspection process. FIG. 10 is a diagram showing the state of the motion detector 1 that rotates the wave receiving direction. FIG. 2 is a diagram showing the state of the motion detector 1 moving in the forward direction. FIG. 10 is a diagram showing the state of the motion detector 1 moving in the reverse direction. FIG. 1 is a diagram showing an example of a movement sensor 1 having a rotating portion 15. 10A and 10B are diagrams showing the movement of the movement detector 1 in a modified example.

<Embodiment>
<Configuration of possession inspection device>
In the following figures, the space in which each component is arranged is represented as an XYZ right-handed coordinate space or an xyz right-handed coordinate space. Among the coordinate symbols shown in the figures, a dot in a circle represents an arrow pointing from the back of the page to the front, and a circle with two intersecting lines represents an arrow pointing from the front of the page to the back. The direction along the x-axis in space is referred to as the x-axis direction. Furthermore, within the x-axis direction, the direction in which the x-component increases is referred to as the +x direction, and the direction in which the x-component decreases is referred to as the -x direction. The y, z, and X, Y, and Z components are defined in the same way as the x-component.

Figure 1 is a plan view showing an example of a personal belongings inspection device 9 according to an embodiment of the present invention, viewed from above. In Figure 1, the -Z direction is downward, i.e., the direction of gravity, the X axis direction is the direction of the width of path Pa, and the Y axis direction is the direction along path Pa. The personal belongings inspection device 9 is a device that inspects the belongings of person Q walking in the +Y direction along path Pa. This personal belongings inspection device 9 has a movement detector 1, a fixed detector 2, and an entry/exit detector 4. This personal belongings inspection device 9 also has an information processing device 3, which is not shown in Figure 1.

Mobile detector 1 and fixed detector 2 are both devices that receive (or receive) electromagnetic waves such as terahertz waves emitted by person Q and objects (called possessions) held by person Q, and detect the possessions from the difference in the intensity of the electromagnetic waves. Mobile detector 1 has a common configuration with fixed detector 2, except that it can move.

The moving sensors 1 shown in Figure 1 are arranged one on each side of the path Pa on the far side (i.e., the +Y direction). The fixed sensors 2 shown in Figure 1 are arranged one on each side of the path Pa on the near side (i.e., the -Y direction).

When positioned as shown in Figure 1, mobile detector 1 and fixed detector 2 receive electromagnetic waves from person Q and their belongings, who are located near the center of path Pa in the Y-axis direction. The path along which these electromagnetic waves propagate is called propagation path D. Person Q is the person who is the subject of inspection by mobile detector 1 and fixed detector 2 of the belongings inspection device 9, i.e., the person being inspected.

In Figure 1, the fixed sensor 2 on the front right side and the motion sensor 1 on the back left side are opposed to each other as seen by a person Q moving in the +Y direction along path Pa. The same holds true for the fixed sensor 2 on the front left side and the motion sensor 1 on the back right side as seen by a person Q moving in the +Y direction along path Pa.

Mobile detector 1 and fixed detector 2 each scan person Q and their belongings in the Z-axis direction. Furthermore, as person Q walks (moves) along path Pa in the +Y direction, person Q and their belongings pass through propagation path D of the electromagnetic waves received by mobile detector 1 and fixed detector 2, respectively. As a result, mobile detector 1 and fixed detector 2 scan person Q and their belongings in the Y-axis and X-axis directions (i.e., horizontally).

Entry/Exit Detector 4 is configured to detect when Person Q enters or exits a specified range on Path Pa. This specified range is the range in which electromagnetic waves are detected by Mobile Detector 1 and Fixed Detector 2. As shown in Figure 1, for example, Entry/Exit Detector 4 has pairs of elements on the left and right that emit light such as infrared light and detect this light, and detects when Person Q blocks the light, thereby detecting the entry and exit of Person Q.

The entrance/exit detector 4 is not limited to those using infrared rays, but may also use visible light, sound waves, etc. The entrance/exit detector 4 may also be, for example, a load cell placed below the path Pa. In this case, the entrance/exit detector 4 detects the entry and exit of person Q by measuring the weight of person Q who enters a specified area of path Pa.

<Configuration of movement detector>
Fig. 2 is a side view of the internal configuration of the motion sensor 1. Fig. 2 shows the motion sensor 1 as viewed from the arrow II-II in Fig. 1. Fig. 3 is a top view of the internal configuration of the motion sensor 1. Fig. 3 shows the inside of the motion sensor 1 arranged in area III in Fig. 1.

The xyz right-handed coordinate system shown in Figure 1 is a coordinate system obtained by rotating the XYZ right-handed coordinate system around the Z axis and changing the names of X, Y, and Z to x, y, and z, respectively. Therefore, the z-axis direction of the xyz right-handed coordinate system is the same as the Z-axis direction of the XYZ right-handed coordinate system. In Figure 2 mentioned above, the direction in which motion sensor 1 is viewed is the -y direction in the xyz right-handed coordinate system.

The movement detector 1 shown in Figures 2 and 3 has a polygon mirror 10, a radome 11, a collecting mirror 12, a sensor 13, and a moving unit 14. The movement detector 1 is also connected to an information processing device 3 so that it can communicate wirelessly or via a wire. The polygon mirror 10, collecting mirror 12, sensor 13, and moving unit 14 of the movement detector 1 are controlled by the information processing device 3.

Note that the polygon mirror 10 is omitted from Figure 2. Also, the sensor 13 and information processing device 3 are omitted from Figure 3.

The radome 11 is a plate-shaped member made of a resin material that is relatively transparent to electromagnetic waves, such as polyethylene, polypropylene, polytetrafluoroethylene, or polymethylpentene. The radome 11 allows electromagnetic waves arriving from outside the housing of the motion detector 1 to pass through to the interior, while protecting the interior from dust and other particles.

The polygon mirror 10, the focusing mirror 12, and the sensor 13 form the sensor unit U1. This sensor unit U1 is a rectangular parallelepiped unit, for example, 200 mm wide, 300 mm deep, and 400 mm high.

The polygon mirror 10 shown in Figure 3 is a polygonal mirror that rotates around an axis F extending in the y-axis direction. The shape of the polygon mirror 10 is, for example, a quadrangular pyramid. Electromagnetic waves propagating along the propagation path D pass through the radome 11, are reflected by the polygon mirror 10, and are collected by the collecting mirror 12.

By rotating around axis F, the angle of the reflective surface of the polygon mirror 10 changes, so the range over which the polygon mirror 10 receives (senses) waves becomes a sector-shaped sensing area Ra centered on axis F as shown in Figure 2. In other words, by rotating the polygon mirror 10 around axis F, the motion detector 1 scans in the Z-axis direction.

The collecting mirror 12 shown in Figure 2 is a mirror that reflects the electromagnetic waves collected by scanning the sensing area Ra with the polygon mirror 10 (see Figure 3) to the sensor 13. The collecting mirror 12 is, for example, a parabolic mirror.

The sensing area Ra is the area in which the motion sensor 1 can sense electromagnetic waves. The sensing area Ra shown in Figure 2 is located at an angle of approximately 100 degrees from the +z direction to the -z direction around the axis F, and is within a distance of approximately 1 meter. The thickness of the sensing area Ra in the y-axis direction is several centimeters.

Sensor 13 senses electromagnetic waves, such as terahertz waves, collected and reflected by collecting mirror 12 and measures their intensity. Terahertz waves are, for example, electromagnetic waves with a frequency of 100 GHz or higher but lower than 10 THz. Sensor 13 shown in Figure 2 senses electromagnetic waves in the 100 GHz band emitted by person Q shown in Figure 1. In other words, sensor 13 is an example of a sensor that senses electromagnetic waves emitted by the person being tested.

For example, person Q emits terahertz waves in the 100 GHz band. On the other hand, if person Q hides an object that is difficult for terahertz waves to penetrate, such as metal, inside their clothing, the terahertz waves emitted by person Q will be blocked by that object. Therefore, when movement detector 1 scans person Q, it generates an image in which the intensity of the received waves varies around the outline of the object mentioned above. Information processing device 3 acquires and analyzes this image generated by movement detector 1 to identify the shape of person Q's belongings.

In this way, the personal belongings inspection device 9 detects objects such as metals, explosives, ceramics, flammable liquids, etc. that person Q has hidden inside their clothing.

Due to the spatial resolution of sensor 13, the objects that motion detector 1 can inspect are, for example, those with a size of 10 centimeters square or more and a thickness of 3 centimeters or more. Furthermore, due to the temporal resolution of sensor 13, the upper limit of the speed at which an object can be inspected is 4 kilometers per hour. Furthermore, the time required for motion detector 1 to inspect is, for example, 0.03 seconds.

The moving unit 14 is configured to move the movement detector 1 under the control of the information processing device 3. The moving unit 14 shown in Figure 2 includes a motor, swivel casters, tires, etc. The moving unit 14 moves the movement detector 1 by driving the tires that are in contact with the ground.

The moving unit 14 shown in FIG. 3 rotates the motion detector 1 around an axis parallel to the z-axis, for example, by adjusting the angles of the four tires. The moving unit 14 shown in FIG. 3 also moves the motion detector 1 in a straight line, for example, by aligning the orientation of the four tires.

<Configuration of fixed detector>
Fig. 4 is a side view of the internal configuration of the fixed sensor 2. Fig. 4 shows the fixed sensor 2 as viewed from the arrow IV-IV in Fig. 1. Fig. 5 is a top view of the internal configuration of the fixed sensor 2. Fig. 5 shows the inside of the fixed sensor 2 arranged in area V in Fig. 1.

The fixed detector 2 shown in Figures 4 and 5 has a polygon mirror 20, a radome 21, a collecting mirror 22, and a sensor 23. These correspond to the polygon mirror 10, the radome 11, the collecting mirror 12, and the sensor 13 in the mobile detector 1, respectively. The sensor unit U2 in the fixed detector 2 corresponds to the sensor unit U1 in the mobile detector 1.

Furthermore, like the mobile detector 1 described above, this fixed detector 2 is connected to the information processing device 3 wirelessly or via wired communication. The polygon mirror 20, collecting mirror 22, and sensor 23 of the fixed detector 2 are controlled by the information processing device 3.

This fixed sensor 2 differs from the mobile sensor 1 in that it does not have a configuration equivalent to the moving unit 14. Therefore, the fixed sensor 2 does not move like the mobile sensor 1.

<Configuration of information processing device>
6 is a diagram showing an example of the configuration of the information processing device 3. As shown in Fig. 6, the possession inspection device 9 has an information processing device 3 connected to a movement detector 1, a fixed detector 2, and an entrance/exit detector 4. The information processing device 3 has a processor 31, a memory 32, an interface 33, and a display unit 35.

Memory 32 includes RAM (Random Access Memory), ROM (Read Only Memory), a solid-state drive, a hard disk drive, etc., and stores the operating system, various computer programs (hereinafter simply referred to as programs), data, etc.

The processor 31 controls each part of the information processing device 3 by reading and executing the operating system and programs from the memory 32. The processor 31 is, for example, a CPU (Central Processing Unit). The processor 31 may also be, for example, an FPGA (Field Programmable Gate Array), or may include an FPGA. The processor may also have an ASIC (Application Specific Integrated Circuit) or other programmable logic device, and may perform control using these.

The interface 33 is a communication circuit that communicatively connects the information processing device 3 to other devices via wired or wireless connections. This interface 33 is communicatively connected to the movement detector 1, fixed detector 2, and entrance/exit detector 4.

When the entry/exit detector 4 detects that person Q has entered or exited a specified range, the interface 33 acquires that information and transmits it to the processor 31.

Movement detector 1 and fixed detector 2 also receive electromagnetic waves emitted from the space containing person Q, generate images corresponding to the strength of the electromagnetic waves in each direction, and send them to information processing device 3. The interface 33 of information processing device 3 acquires these images and passes them on to processor 31. Processor 31 analyzes these images to identify the shapes of items held by person Q.

The display unit 35 has a display screen such as an LCD display, and displays images under the control of the processor 31. The display unit 35 also includes display screens provided on the entrance side of the route Pa and in the center. The display screen provided on the entrance side displays messages, etc. to test subjects who are entering a designated area of the route Pa. The display screen provided in the center displays messages, etc. to test subjects who are within the designated area of the route Pa.

<Operation of the possession inspection device>
7 is a flow diagram showing an example of the operation flow of the personal belongings inspection device. When the processor 31 starts the operating system, it controls the display screen at the entrance of the display unit 35 to notify the user that entry is prohibited (step S001). The processor 31 then starts an inspection program and performs a startup process to initialize each unit (step S002). This startup process includes, for example, checking the rotation speed and calibration of the motors (not shown) in the sensor unit U1 of the mobile detector 1 and the sensor unit U2 of the fixed detector 2.

The processor 31 determines whether an abnormality has occurred during the startup process (step S003). If it determines that an abnormality has occurred (step S003; YES), the processor 31 notifies the user of the abnormality via the display unit 35 (step S004) and terminates the process.

On the other hand, if it is determined that no abnormality has occurred (step S003; NO), the processor 31 notifies the person of permission to pass via the screen at the entrance described above (step S005) and executes the primary inspection process (step S100).

Figure 8 is a flow diagram showing an example of the operational flow of the primary inspection process. Based on information acquired from the entry/exit detector 4, the processor 31 determines whether the entry/exit detector 4 has detected the entry of person Q (step S101). While it determines that the entry/exit detector 4 has not detected the entry of person Q (step S101; NO), the processor 31 continues this determination.

On the other hand, if the entry/exit detector 4 determines that it has detected the entry of person Q (step S101; YES), the processor 31 notifies the person on the display screen at the entrance of the display unit 35 that entry is prohibited (step S102), and the mobile detector 1 and fixed detector 2 scan for person Q entering path Pa and walking along path Pa (step S103).

Then, the processor 31 generates an image based on the intensity signal for each receiving direction of the electromagnetic waves obtained by scanning (step S104), and analyzes this image to determine whether person Q is suspected of possessing a dangerous item (step S105).

The primary inspection inspects person Q walking, i.e., moving, along path Pa. During this primary inspection, movement detector 1 does not move. In other words, this possession inspection device 9 is an example of a possession inspection device that does not move any of the multiple detectors while the person being inspected is moving along the path.

If it is determined that person Q is not suspected of possessing a dangerous item (step S105; NO), the processor 31 guides person Q to exit (step S106) and determines whether the entry/exit detector 4 has detected person Q's exit (step S107).

While determining that the entry/exit detector 4 has not detected the exit of person Q (step S107; NO), the processor 31 returns the process to step S106.

On the other hand, if it is determined that the entry/exit detector 4 has detected the exit of person Q (step S107; YES), the processor 31 displays permission to pass on the display screen at the entrance (step S108) and ends the process.

If it is determined in step S105 that person Q is suspected of possessing a hazardous substance (step S105; YES), the processor 31 causes the display unit 35 to issue a warning that person Q is suspected of possessing a hazardous substance (step S109).

Then, processor 31 determines whether a secondary inspection is necessary (step S110). If it determines that a secondary inspection is necessary (step S110; YES), processor 31 executes the secondary inspection process (step S200). On the other hand, if it determines that a secondary inspection is not necessary (step S110; NO), processor 31 terminates the process without executing step S200.

Figure 9 is a flow diagram showing an example of the operational flow of the secondary inspection process. The processor 31 controls the motion detector 1 via the interface 33 to rotate its wave receiving direction (step S201).

Figure 10 is a diagram showing a motion detector 1 rotating its wave receiving direction. Figure 10 shows a top view of the configuration of a personal belongings inspection device 9. Each motion detector 1 in Figure 10 rotates in the direction of arrow M1 under the control of an information processing device 3 (not shown). This rotation is achieved by the movement unit 14 of the motion detector 1. As a result of this rotation, the propagation path D, which is the wave receiving direction of the motion detector 1, is aligned along the X-axis direction.

When the wave receiving direction of the motion detector 1 is rotated, as shown in FIG. 9, the processor 31 guides the person Q, who is the subject of inspection, to assume a first posture (step S202). Here, the first posture refers to the first posture of the person Q who stopped in the secondary inspection process, for example, a standing position with the front of the body facing the direction of travel of the path Pa. Posture guidance may be performed, for example, by a speaker (not shown) that outputs sound under the control of the information processing device 3. Posture guidance may also be performed by displaying on the LCD screen of the display unit 35.

Once person Q has been guided to the first posture, processor 31 determines whether person Q has been confirmed to be in the first posture (step S203). This confirmation may be performed by analyzing images from a surveillance camera, or by operation by the operator of possessions inspection device 9.

While determining that person Q's first posture has not been confirmed (step S203; NO), processor 31 continues this determination. On the other hand, when determining that person Q's first posture has been confirmed (step S203; YES), processor 31 moves movement detector 1 forward to perform scanning (step S204).

Figure 11 shows a mobile sensor 1 moving in the forward direction. Here, the forward direction is the direction approaching the position of the fixed sensor 2. In the example shown in Figure 11, the forward direction is the -Y direction. The mobile sensors 1, one on each side of the path Pa, receive electromagnetic waves along propagation path D while moving straight ahead in the forward direction, indicated by arrow M2, under the control of the information processing device 3.

At this time, person Q is stopped while maintaining a first posture with the front of their body facing along the direction of travel of path Pa (+Y direction). Movement sensor 1, which moves forward to scan person Q, receives electromagnetic waves via propagation path D, which is perpendicular to the direction of travel of path Pa. While moving forward, movement sensor 1 maintains its receiving direction. Therefore, movement sensor 1 generates an image based on electromagnetic waves emitted from the side of person Q.

In other words, the personal belongings inspection device 9 equipped with this mobile detector 1 is an example of a personal belongings inspection device that inspects the personal belongings of a person being inspected by moving at least one of multiple detectors that detect electromagnetic waves while maintaining the wave receiving direction.

Movement detectors 1, located on the left and right, are positioned on either side of path Pa, on which person Q is located. Therefore, these two movement detectors 1 move simultaneously, sandwiching person Q, the person being inspected.

In other words, the personal belongings inspection device 9 having this mobile detector 1 is an example of a personal belongings inspection device that moves at least two of the multiple detectors that sandwich the person being inspected. Furthermore, the personal belongings inspection device 9 having this mobile detector 1 is an example of a personal belongings inspection device that moves two detectors simultaneously.

When the movement detector 1 is moved in the forward direction, as shown in FIG. 9, the processor 31 guides the person Q, who is the subject of inspection, to assume a second posture (step S205). Here, the second posture refers to the second posture of the person Q who stopped during the secondary inspection process, and is, for example, a standing position with the front of the body facing perpendicular to the direction of travel of the path Pa.

Once person Q has been guided to the second posture, processor 31 determines whether the second posture of person Q has been confirmed (step S206). This confirmation may be performed by analyzing images from a surveillance camera, or by operation by the operator of possessions inspection device 9.

While determining that person Q's second posture has not been confirmed (step S206; NO), processor 31 continues this determination. On the other hand, when determining that person Q's second posture has been confirmed (step S206; YES), processor 31 moves movement detector 1 in the opposite direction to perform scanning (step S207).

Figure 12 shows a mobile detector 1 moving in the reverse direction. Here, the reverse direction is the opposite of the forward direction, and refers to the direction moving away from the position of the fixed detector 2. In the example shown in Figure 12, the reverse direction is the +Y direction.

In step S204, the mobile sensor 1 moves forward and approaches the fixed sensor 2. Under the control of the information processing device 3, the mobile sensor 1 moves straight in the opposite direction, indicated by arrow M3, and receives electromagnetic waves along propagation path D.

At this time, person Q is stopped while maintaining a second posture in which the front of their body is facing in a direction perpendicular to the direction of travel of path Pa (+Y direction). Movement detector 1, which moves in the opposite direction to scan person Q, receives electromagnetic waves via propagation path D along a direction perpendicular to the direction of travel of path Pa. While moving in the opposite direction, movement detector 1 maintains its receiving direction. Therefore, movement detector 1 generates an image based on electromagnetic waves emitted from the front and back of person Q.

When the motion detector 1 is moved in the reverse direction and returned to the position where it started moving forward, the processor 31 rotates the motion detector 1 to return its wave receiving direction to its original position, as shown in Figure 9 (step S208). At this time, the motion detector 1 rotates in the opposite direction to the arrow M1 shown in Figure 10 and returns to its original position.

Processor 31 analyzes the image of person Q observed from the side, which is generated when movement detector 1 is moved in the forward direction. Processor 31 also analyzes the images of person Q observed from the front and back, which are generated when movement detector 1 is moved in the reverse direction (step S209).

Then, processor 31 identifies the shape of the belongings based on the results of the image analysis. For example, processor 31 refers to a database of dangerous object shapes stored in memory 32, and calculates the degree of match between the identified shape and pre-stored shapes of dangerous objects (step S210).

Based on the calculated degree of similarity, the processor 31 determines whether person Q is suspected of possessing a dangerous item (step S211).

Here, during the secondary inspection, person Q, the person being inspected, remains stationary while maintaining either the first or second posture as instructed. At this time, this possession inspection device 9 moves two movement detectors 1 to receive electromagnetic waves emitted by person Q. In other words, this possession inspection device 9 is an example of a possession inspection device that moves at least one of multiple detectors while the person being inspected is stationary.

Furthermore, in the secondary inspection of this embodiment, the forward and reverse directions in which the motion detector 1 moves are both along the path Pa. In other words, this possession inspection device 9 is an example of a possession inspection device that moves the detector along the path when the detector is moved.

If it is determined that person Q is suspected of possessing a dangerous item (step S211; YES), the processor 31 issues a warning via the display unit 35 (step S212) and terminates the process.

On the other hand, if it is determined that person Q is not suspected of possessing a dangerous item (step S211; NO), processor 31 guides person Q to exit (step S213). Then, processor 31 determines whether entry/exit detector 4 has detected person Q's exit (step S214).

While determining that the entry/exit detector 4 has not detected the exit of person Q (step S214; NO), the processor 31 returns the process to step S213.

On the other hand, if it is determined that the entry/exit detector 4 has detected the exit of person Q (step S214; YES), the processor 31 displays permission to pass on the display screen at the entrance (step S215) and ends the process.

By performing the operations described above, the possessions inspection device 9 uses the motion detector 1 used for the primary inspection for the secondary inspection as well, eliminating the need to provide separate space or equipment for the secondary inspection.

The configurations, shapes, sizes, and layout relationships described in the above embodiments are merely schematic representations intended to enable the present invention to be understood and implemented. Therefore, the present invention is not limited to the described embodiments, and can be modified in various forms without departing from the scope of the technical concept set forth in the claims.

<Modification>
The above is a description of the embodiment, but the contents of this embodiment can be modified as follows. In addition, the following modifications can be combined.

<1>
In the above-described embodiment, the moving unit 14 can move the motion sensor 1 in a straight line as well as in a rotational direction, but the moving unit 14 may only move the motion sensor 1 in a straight line. In this case, the motion sensor 1 may have a rotating unit 15 that rotates its own sensor unit U1 around an axis parallel to the z-axis.

Figure 13 is a diagram showing an example of a motion detector 1 having a rotating unit 15. The motion detector 1 shown in Figure 13 has the rotating unit 15 mounted on top of the moving unit 14, which includes a motor and tires, and a housing containing the sensor unit U1 of the motion detector 1 mounted on top of that. The rotating unit 15 is a turntable with an axis parallel to the z-axis, and can rotate the upper housing relative to the lower moving unit 14 under the control of the information processing device 3. In this case as well, the wave receiving direction of the motion detector 1 rotates.

In this modified example, since the moving unit 14 does not need to change the wave receiving direction of the motion sensor 1, it may include, for example, wheels that move along rails. The moving unit 14 may also include a pinion in a rack-and-pinion mechanism. In this case, the rail or rack on which the motion sensor 1 rides via the above-mentioned wheels or pinion need only be provided along the path Pa.

In addition, in this modified example, the rotating unit 15 is mounted on the moving unit 14, so the wave receiving direction of the motion detector 1 can be rotated even if the moving unit 14 does not move. Therefore, this personal belongings inspection device 9 is an example of a personal belongings inspection device that, when moving the detector, changes the wave receiving direction before starting the movement and maintains the changed wave receiving direction while moving.

<2>
In the above-described embodiment, the possession inspection device 9 changes the wave receiving direction of the motion detector 1 by rotating the motion detector 1, and then moves the motion detector 1 in a straight line. However, the possession inspection device 9 does not have to change the wave receiving direction of the motion detector 1 before moving the motion detector 1 in a straight line.

Figure 14 shows the movement of the moving detector 1 in a modified example. The moving detector 1 shown in Figure 14 is placed on the front right side of the path Pa, one on each side, and on the back left side. The fixed detector 2 shown in Figure 14 is placed on the front left side of the path Pa, one on each side, and on the back right side.

When starting the secondary inspection, the possession inspection device 9 shown in Figure 14 prompts the person Q, who is the subject of inspection, to assume a third posture. This third posture is, for example, facing diagonally 45 degrees to the left with respect to the path Pa.

Then, this possession inspection device 9 moves the two motion detectors 1 described above back and forth in a straight line along the direction of arrow M4, which is 45 degrees diagonal to the right of path Pa, toward person Q who is in the third posture. During this back and forth movement, the motion detectors 1 receive electromagnetic waves via propagation path D and generate an image based on these electromagnetic waves. In this case, the wave receiving direction of the motion detectors 1 during the secondary inspection remains unchanged from that during the primary inspection. Even with this configuration, the motion detectors 1 can inspect possessions regardless of whether the person being inspected is moving or stationary.

1...Moving detector, 10...Polygon mirror, 11...Radome, 12...Condenser mirror, 13...Sensor, 14...Moving unit, 15...Rotating unit, 2...Fixed detector, 20...Polygon mirror, 21...Radome, 22...Condenser mirror, 23...Sensor, 3...Information processing device, 31...Processor, 32...Memory, 33...Interface, 35...Display unit, 4...Entry/exit detector, 9...Personal belongings inspection device, U1, U2...Sensor unit

Claims (6)

A plurality of sensors are provided to detect electromagnetic waves emitted from the subject of inspection ,
When the subject is moving along a path, none of the plurality of sensors is moved,
A personal belongings inspection device that inspects the personal belongings of the person being inspected by moving at least one of the plurality of sensors while maintaining the receiving direction when the person being inspected is stationary . The personal belongings inspection device according to claim 1 , wherein when the detectors are moved, at least two detectors that sandwich the person to be inspected are moved. The personal belongings inspection device according to claim 2, wherein when the detectors are moved, two of the detectors are moved simultaneously. The personal belongings inspection device according to claim 1 , wherein when the detector is moved, the detector is moved along the path. The personal belongings inspection device according to claim 1 , wherein when the detector is moved, the detector changes the wave receiving direction before starting the movement, and maintains the changed wave receiving direction during the movement. When the detector is moved,
After confirming that the subject has taken a first posture, the detector is moved in a first direction;
After confirming that the stopped test subject has a second posture different from the first posture, the sensor is moved in a second direction different from the first direction.
The personal belongings inspection device according to any one of claims 1 to 5.